Revert "Added dates for October 2024 Build Systems Hackathon"

This reverts commit 2aaf902.

Reverted because it showed up in my calendar for every single day,
including present week.

calendars/workshops.yaml

@@ -98,19 +98,3 @@ events:
     timezone: Europe/Stockholm
     begin: 2023-10-09 15:00:00
     duration: {hours: 1, minutes: 30}
-
-  # October 2024 Build Systems Hackathon (two segments since it is split over two weeks)
-  - &bsh-2024-oct
-    summary: Build Systems Hackathon, October 2024
-    location: https://coderefinery.org/workshops/upcoming/
-    begin: 2024-10-08 08:50:00
-    timezone: Europe/Stockholm
-    duration: {minutes: 10, hours: 3}
-    repeat:
-      interval: {days: 1}
-      until: 2023-10-10 12:00:00
-  - <<: *bsh-2024-oct
-    begin: 2023-10-15 9:00:00
-    repeat:
-      interval: {days: 1}
-      until: 2024-10-17 16:00:00